Please note I plan on adding more pages
and separating TV help, from VCR help, and so on. Tips will be
added to my site. There are unlimited possibilities. This is
strictly voluntary, on my part. Please visit the links, I have,
and register where appropriate.

Click on a link to download or view the
information.

Most files require WinZip to open. Some
require Adobe Acrobat to view.

Tritronics Inc is the
website to check out. Excellent searching capabilities,
you immediately see if the part is in stock, you also see
other parts they cross to, if available. Don't know the
part number? NO PROBLEM! Just enter the model number and
they list every part available with part numbers and
price. Order online, check their price online. Click the
logo to the right to request your catalog.

Electronics
- Home PageI
sell Sams Photofacts, service manuals, and
owner's manuals for various brands of TVs and
audio equipment, as well as antique radios,
parts, used electronics books, new and used
vacuum tubes.

Bil has put
together a list of generic subs for 300 ECG transistors and
diodes. These subs are exactly the same, not just similar.
Save hundreds of dollars using the generic equivalent. Keep
checking here as I get more information.

On the old HV Block, cut
the 2 ground wires, leaving sufficient length from the
connector end so these wires can be spliced onto the ends of the
ground wires on the
new HV Block. On the New HV Block, cut the 2 ground wires
near the 4-pin connector
and discard the connector. Strip down the insulation,
noticing that one of the
wires has a shielding. This shielded cable (both the
shielded wire and the
shielding) should be spliced to one of the wires with the ground
connectors at the
end (that was removed from old HV Block) for connecting to ground
in the PTV. The
other single wire should be spliced to the other wire with the
ground connector at
the end (that was removed form the old HV Block) for connecting
to the other ground
in the PTV. Both of these grounds are connected to the same
ground on this model
PTV. For Splicing, it is best to use heat shrink tubing
over a soldered connection. The ¼ turn twist-lock
connector leading from the flyback will have to be screwed
onto the single input of the new HV Block until electrical
connection is made
internally. This twist-lock connector usually splits apart
but if you hold it
firmly in place and wrap a small tie-wrap around it, tightening
the tie-wrap should
hold it firmly in place. The new HV Block has a spring-loaded
connection down
inside that needs slight pressure to hold the connection together.
The 3 high voltage outputs to the CRTs use the same screw-type
connectors on the new
HV Block. The 2 mounting screws should mount the same as
the old HV Block. I have used this method for many RCA and
Hitachi PTVs and all have been successful.
Thanks to Robert Ford

This is a fast check for
Sony power supplies. The important thing to
remember about these supplies is that it is a push pull amplifier.
The load
across the 2 transistors must be close to equal or it will self-destruct.
The frequency is the regulating part of the equation. They
are designed to
start at a high frequency out of resonance and be pulled lower by
the
regulator toward resonant frequency to achieve proper regulation.
The supply
will oscillate at very low voltages and this is the only way to
check them
out.
After doing the usual repair of transistors and I generally
include the
damper diodes (you can use Sony parts but they are subbing to a 1N5401).
If
you don't know why the supply blew up, check the Horizontal
output and look
for rings around the driver transformer.
First pull the relay RY602. This will prevent the set from
trying to power
up during repair and testing.
Monitor the voltage at Q601 collector or R607 is just as good.
Scope Q602 collector for waveform and DC voltage. Lower
the AC voltage to 20 volts DC. The supply should be
oscillating and
each transistor should be dropping 10 volts. If that looks
good run the DC
up to 40 Volts.
At about 80 volts DC the current drawn by the supply should peek
and start
to decline with further increase in voltage. You should
also have a nice
square wave of equal duty time with no peeks or ringing.
Each transistor
should be dropping 40 volts. You may see a slight bounce
in the supply frequency at this time. The
standby is up enough to turn the micro on and the slow start
circuit is
trying to bring the run supplies up to full value. Of
course this won't
happen with the relay still out. I continue to increase
the DC stopping at 150 volts and 200 volts. These
are nice round numbers that are easy to work with. If
everything is looking
OK then run the supply on up to full value. You should have
16 volts on
D619 reference to cold ground. The supply is now running
at full voltage. If you have fixed all problems
on the secondary side you can reinstall the relay and tune for
minimum
smoke.
Thanks to Daniel Mundy

1. STAND-BY, MUTE, 1, 8,
2, POWER ON
2. "FACTORY MODE" message will be displayed. The
Factory Mode has five
components: Adjustment, MPX adjust, test Pattern, Set Option
Byte, and
Factory Reset.
3. Access the Adjustment Mode be pressing the "VOLUME"
keys ().
The adjustment parameters are listed in the table.
Select them by pressing the CHANNEL keys (^, v).
4. After completing the Factory Mode adjustments, turn the power
off.